CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
CONSOLIDATED STATEMENTS OF OPERATIONS
REVENUE	$ 465,411	$ 427,538	$ 845,999	$ 813,480
COST OF SERVICES	369,673	338,112	674,307	650,552
Gross profit	95,738	89,426	171,692	162,928
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	66,599	61,023	129,846	119,213
GOODWILL IMPAIRMENT			1,105
GAIN ON SALE OF ASSETS	(126)	(212)	(280)	(357)
Operating income	29,265	28,615	41,021	44,072
OTHER INCOME (EXPENSE):
Interest income	28	2	39	3
Interest expense	(1,041)	(606)	(1,431)	(1,307)
Changes in the fair value of contingent earn-out obligations	(598)	(336)	(624)	(336)
Other	29	(111)	47	375
Other income (expense)	(1,582)	(1,051)	(1,969)	(1,265)
INCOME BEFORE INCOME TAXES	27,683	27,564	39,052	42,807
INCOME TAX EXPENSE	9,711	9,847	13,603	15,249
NET INCOME	$ 17,972	$ 17,717	$ 25,449	$ 27,558
Basic-
Net income (in dollars per share)	$ 0.48	$ 0.47	$ 0.68	$ 0.74
Diluted-
Net income (in dollars per share)	$ 0.48	$ 0.47	$ 0.67	$ 0.73
SHARES USED IN COMPUTING INCOME PER SHARE:
Basic (in shares)	37,296	37,437	37,272	37,390
Diluted (in shares)	37,705	37,911	37,714	37,870
DIVIDENDS PER SHARE (in dollars per share)	$ 0.075	$ 0.070	$ 0.145	$ 0.135